Keith is the leader of the Voltron Force, he first piloted the Green Lion for a very short time before becoming pilot of the Black Lion.

Origin

GoLion

Akira Kogane was a human captured into slavery by the Gairan Empire and forced to fight for the amusement of the Gairans, after surviving a battle with the Deathblack Beastmen. He and 4 other survivors managed to escape aboard a stolen slave ship and made their way to a planet ruled by the lovely Princess Fara, there they found the robot Lions that formed the legendary GoLion.